Tridonic Atco 24138923 is a DALI-USB interface that connects a PC to a DALI lighting bus for commissioning, programming and monitoring using Tridonic's masterCONFIGURATOR software. The compact 51 x 30 x 105 mm housing uses screw terminals for the DALI field wiring. It is a service and integration tool for building lighting installations based on the DALI standard.